Q: privilege and role to view all object in own schema

Hi all Oracle Gurus

    I found problem, as usual. I need grant some roles and privilege   to some user. I want user to see all objects in his schema (   packages, tables, data in tables ...) without any possibility to change thos data, and I want him to not see object from other schemas   in the same database.

           Thanks to you,

                                      Starous